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Problem w/ crumar DK61 as aux keyboard
Posted: 13 May 2026, 16:33
by playsabadguitar
I’m using the Crumar DK61 as a midi controller/aux KB with my Stage 4 Compact.
At seemingly random points the two boards stop communicating and the Crumar goes silent. To get it back, I need to disconnect the midi cable from the Nord and plug it back in. Unplugging the Crumar’s power and plugging it back in does not fix it. Disconnecting the midi from the Crumar and plugging it back in does not work either.
Re: Problem w/ crumar DK61 as aux keyboard
Posted: 13 May 2026, 17:22
by FZiegler
Communicating isn't that much of an appropriate term if we are talking about classical MIDI. As far as I understand, the Crumar is sending data (MIDI-out) and the Stage is receiving (MIDI-in). No talking to each other.
Hopefully, you haven't connected them in both directions (two cables) and created a MIDI loop? Which could explain why at some point one of them is overloaded and quits service.
You don't have a third keyboard that sends DIN-MIDI, do you? Just to swap it with the Crumar and see if the latter is the culprit.
I'm a little amazed by your description: You say that disconnecting the MIDI cable from the Crumar doesn't help, disconnecting it from the Nord does. That shouldn't happen because in both cases MIDI is disconnected between both of them. What if the cable is the problem? Or there's something totally weird inside the MIDI socket of the Nord: That's some sort of circuit to disconnect the Nord electrically from the connection line (an optocoupler).
Re: Problem w/ crumar DK61 as aux keyboard
Posted: 13 May 2026, 23:29
by Eumel
Hi,
I‘m curious: are you - besides the described problem - happy with the DK61?
Thanks
Eumel
Re: Problem w/ crumar DK61 as aux keyboard
Posted: 13 May 2026, 23:49
by maxpiano
FZiegler wrote: Yesterday, 17:22
Communicating isn't that much of an appropriate term if we are talking about classical MIDI. As far as I understand, the Crumar is sending data (MIDI-out) and the Stage is receiving (MIDI-in). No talking to each other.
Hopefully, you haven't connected them in both directions (two cables) and created a MIDI loop? Which could explain why at some point one of them is overloaded and quits service.
You don't have a third keyboard that sends DIN-MIDI, do you? Just to swap it with the Crumar and see if the latter is the culprit.
I'm a little amazed by your description: You say that disconnecting the MIDI cable from the Crumar doesn't help, disconnecting it from the Nord does. That shouldn't happen because in both cases MIDI is disconnected between both of them. What if the cable is the problem? Or there's something totally weird inside the MIDI socket of the Nord: That's some sort of circuit to disconnect the Nord electrically from the connection line (an optocoupler).
Good analysis, I would just add that, considering that DK61 has only a MIDI OUT (DIN) I would look at the MIDI cable first (then also do a test with a different external master)
EDIT: of course unless both are also connected via USB to a computer and some MIDI routing loop happens at that level, but it doesn't seem to be the case here.